If you use FOIL to multiply these two brackets, it will lead you what is exactly written (xa+xb+ya+yb)
so it is correct
A
Answer:
a) Given expression,
12% of 312
Since 100% of 312 = 312
⇒ 10% of 312 = 31.2,
⇒ 1% = 3.12
⇒ 2% = 2 × 3.12 = 6.24
So, 12% of 312 = 10% of 312 + 2% of 312
= 31.2 + 6.24
= 37.44
b) Given,
Total number of servings = 312,
The percentage of vitamin C in each serving = 12%,
Thus, the total amount of the vitamin C in 312 servings = 12% of 312
![=\frac{12\times 312}{100}](https://tex.z-dn.net/?f=%3D%5Cfrac%7B12%5Ctimes%20312%7D%7B100%7D)
![=\frac{3744}{100}](https://tex.z-dn.net/?f=%3D%5Cfrac%7B3744%7D%7B100%7D)
= 37.44,
Hence, the question can be asked about the total amount of the vitamin C.
In order from left to right:
D, C, A, B
According to my calculations the answer is 19.5 or 19.50 you can pick either one but your teacher will probably want the first.